Keyhole-lock.



W. P. HYATT & J. W. BROWN.

KEYHOLE LOOK.

APPLIOATION FILED mums, 1914.

1,120,816. Patented Dec. 15,1914.

WP H Y TT W-BRovvN.

THE NORRIS PETERS CO. PHOTO-LITHO.. WASHINGTON. D. C

unrrnn .s'rairns ratrnn'r ca ries.

WILLIAM P. HYATT AND JAMES W. BIEQWN, SACRAMENTO, CALIFORNIA. i

KEY I-IOLE-LOGK.

ments in Keyhole-Locks, of which the following is a specification,reference being had to the accompanying drawings.

guards and has for its primary object to provide a simple and novelsafety device of this character which will effectually preventunauthorized persons from opening the door by means of a pass key andthus obtaining entrance to the apartment.

The invention has for another and more particular object to provide adevice of the above character applicable to thekey hole of a commonmortise lock, either upon the inner or outer .face of the door andabsolutely precludes access to the locking bolt after the door has beenclosed and locked.

The invention has for a still further object to provide a key hole lockor guard which is positive and reliable in practical use, and may beeasily and quickly applied to door locks having key holes of variousdepths.

With the above and other objects in view as will become apparent as thedescription proceeds, the invention consists in certain constructions,combinations and arrangements of the parts that we shall hereinafterfully describe and claim.

For a full understanding of the invention,

' reference is to be had to the following description and accompanyingdrawings, in which Figure 1 is an edge view of a door pro' vided with anordinary mortise lock showing our improved key hole lock or guard deviceapplied thereto; Fig. 2 is a face view, the key being removed from thekey hole guard or locking device; Fig. 3 is an enlarged longitudinalsection through the device with'the key nib in its locking position;Fig. 1: is a side elevation partly in section showing the tumblerreleasing key locked in the key cylinder; Fig. 5 is a section taken onthe line 55 of Fig. 3; Fig. 6 is an elevation, the tumbler retainingsleeve and the spring housing" being removed; Fig. 7 is an" endelevation of the spring housing. r

Referring in detail to the drawings, 5

designates a portion of a door which is pro- I Specification of LettersPatent.

This invention relates to key hole looks or Patented Dec. 15, 1914.

Application filed February 26, 1914. Serial No. 821,249.

vided with an ordinary mortise lock including the locking bolt 6. Theescutcheon plate is provided with a key hole indicated at 7,

through which the ordinary pass key is adapted to be inserted forengagement with I the locking bolt. It is the purposeofthe presentinvention to provide means which will 'eii'ect ually prevent theinsertion of a duplicate. key into the key hole from either side of thedoor after the same has been locked, so that the locking bolt cannot beretracted and the door opened. This device in its preferred, embodimentis con structedsubstantially. in the following manner: A cylindricalbody8 of steel or other metal is formed upon one end with a longitudinallyextending arm 9 preferably of rectangular form in cross section.@pposite' to this arm a longitudinallyextending'opening 10 iseccentrically formed in the body 8.

In this opening,- a metal cylinder 11 is loosely mounted for rotativemovement. This cylinder is formed with a longitudinal key slot 12 whichis adapted to receive the shank of a paracentric key 13. This key wheninserted in said slot is adapted to depress a series of tumbler "pins14: which are loosely mounted in openings 15 formed in the wall of thecylinder 11." Additional spring pressed pins 16 mounted in the body 8also project into these openings 15 and bear against the opposed ends ofthe pins 14. These latter, tumbler pins serve'to lock the cylinder 11against rotary movement in the body. of the device. The coil springs 17which are arranged in pin receiving. openings 18 of the body ll areretained in place by means of the metal sleeve 19,arranged upon the body8. From'reference to Fig. 4, it will be noted that when the key 13 .is

inserted in the slot '12 and the pins 14 ole-1 f I pressed, thecylinderll may be turned to dispose said pins out of alinementwith thepins 16. This turning movement [of the cylinder 11 however, is limitedmeans of a pin or stud 20 projecting fromthe pe riphery of said cylinderat one of its ends which engages with stop. shoulders 21 formed upontheend of the body 8. These shoulders are so spaced from each other'thatthe cylinder 11 may be r'otated'for' a distance of ninety degrees.qlnthenormal position of the cylinder 11, the key 13 is securely lockedin said cylinder by means of the pins 14. The end of the key isprovidedwith a suitable opening whereby the same may be readily attachedto a key ring, in the manner of an ordinary key. One end of the cylinder11 is formed with a cylindrical shank 22 raving a reduced portion 23 inthe end of which a key nib 2 1 is secured. 25 indicates a sleeve orhousing which is telescopically engaged upon the sleeve 19 and carries ascrew 26, the inner end of which is engaged in a longitudinalslot 27formed in the sleeve 19. The closed end of the housing 25 is providedwith a slot 28, one end of which is enlarged to receive the cylindricalshank The other end of this slot accommodates the extension 9 on thebody 8 which projects therethrough beyond the end of the housing. A.coil spring 29 is arranged upon the shank-22 within the housing 25 andbears at one of its ends against the end wall of said housing and at itsother 22 are inserted into the key hole 7. The

projecting end of the rectangular arm 9 is fitted within the lower endport on of the key hole 7 so as to prevent turning movement. of thedevice upon the door. The key having been inserted into the slot 12before thickness of the door.

that in order to remove the device t'rom its the device is arranged in.position upon the door lock, the cylinder 11 is then turned or rotatedto the extent of ninety degrees so as to dispose the tumbler pins 14:carried by said cylinder in alinement with the pins 16 mounted in thebody 8. The key 13 may then be withdrawn as will be readily understood,so that the pins 16 will, upon assuming their normal positions, lockthe. cylinder 11 against further rotation, and thus retain the nib 2thin its locking position in the door lock. The end of the housing 25 fitstightly against the face of the escutcheon plate, said spring bearingagainst the body 8 of the device tends to force the shank 22 outwardly.By the provision of the housing 25 and spring 27, the device may bereadily applied to the key holes of locks irrespective of the It will beobvious insert the key in the slot 12 and reverse the.

movement of the cylinder 11, the pins 15 be- I ing moved out ofalinement with the pin 16 so that said key islocked in the cylinder inthe manner above. explained when the nib 24 is disposed inpositionto bewithdrawn from the key hole 7 The device may then be readily attached tothe chain ring.

From the foregoing, it is believed that the construction, manner ofoperation and,

several advantages of our invention. will be clearly and fullyunderstood.

The device is comparatively simple in its construction, may be veryeasily and quickly applied in its effective locking position and owingto the compact arrangement of the parts, the same may be attached to thekey ring and carried in the pocket without causing the user anyinconvenience. The several cooperating elements of the invention may bevery easily and quickly arranged in assembled position or disassembledwhen re: pairs thereto are necessary. I

It will of course be obvious that the form and proportions of theseveral parts may be greatly varied and we therefore reserve theprivilege or" resorting to all such legitimate changes as may be fairlyembodied within the spirit and scope of the invention as claimed.

Having thusv described the invention, what is claimed is:

1. In a device of the character described, a body member provided with arectangular arm, a rotatable locking member mounted in said body memberand provided with a key shank having a. locking nib, a cylindricalhousing for said body member having a slot in one end through which saidshank and the arm are disposed, said shank and arm being adapted forinsertion into the keyhole of a lock, a key adapted to be engaged withsaid locking member to rotate the same and dispose said nib in itslocking position or in position to be moved out of the keyhole, meansfor locking the key in connection with said rotatable member when theshank has been withdrawn from the keyhole, and a spring arranged withinsaid housing and bearing against said body member, said spring tendingto force the body member outwardly from the keyhole when the device isapplied.

2. In a device of the character described, a body, a cylinder rotatablymounted in said body and provided with a longitudinally extending shankhaving a key nib fixed thereto, a lug projecting from the periphery ofsaid cylinder, spaced shoulders on the body for engagement by said lugto limit the rotation of said cylinder, a housing slidably mounted uponthe body, means for limiting the sliding movement of said housing withrespect to the body, a coil spring arranged upon said shank bearingagainst one end of the housing and at its other end against the body,and means for rotating said cylinder to dispose the key nib in itslocking position.

3. In a device of the character described, a body provided with alongitudinally extending rectangular arm on one end, a cylinderrotatably mounted in said body and provided with a shank extending inthe same direction as said arm, a, key nib fixed to said shank, meansfor limiting the rotative movebearing at its opposite ends against saidbody and the end Wall spectively. 1

In testimony whereof We hereunto afiix our signatures in the presence oftwo Witnesses; v

WILLIAM P. HYATT. JAMES W. BROWN.

Witnesses:

W. A. LATTA,

J. F. Bonus.

Copies of this pate nt may be obtained for five cents each, byaddressing the Commissioner of Patents,

Washington, D. 0.

of the housing re-

